package com.example.demo01.Utils;

public class ArrayUtils {

   public   static byte[]  concatByte(byte[] f, byte[] s) {
        byte[] r= new byte[f.length+s.length];
        System.arraycopy(f, 0, r, 0, f.length);
        System.arraycopy(s, 0, r, f.length, s.length);

        return r;
    }
}
